package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.context.ThreadLocalUtil;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {
    @Autowired
    private RedisTemplate redisTemplate;
    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());
        //2、校验令牌
        try {
            //校验令牌是否存在
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            //对比redis令牌
            ValueOperations valueOperations = redisTemplate.opsForValue();

            String redisToken = (String) valueOperations.get("User_Token");
            if (redisToken != null || redisToken.equals(token)) {
                //管理员一直用的这个别改了，太繁琐了的原因就是Integer和Long类型不匹配
                ThreadLocalUtil.set(claims);
                //用户端
                Map<String, Object> claim = ThreadLocalUtil.get();
                Integer userId = (Integer) claim.get(JwtClaimsConstant.USER_ID);
                BaseContext.setCurrentId(Long.valueOf(userId));
                log.info("当前用户id：{}", userId);
                //3、通过，放行
                return true;
            } else
                return false;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            log.info(MessageConstant.USER_NOT_LOGIN);
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        ThreadLocalUtil.remove();
    }
}
